<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>demo</title>
    <script type="text/javascript" src="../vue.js"></script>
</head>

<body>
    <div id="app">
        <h1>{{msg}}</h1>
    </div>
</body>
<script type="text/javascript">
    Vue.config.productionTip = false
    const vm = new Vue({
        // el: "#app",
        data() {
            return{
                msg: "hello Vue"
            }
        }
    })

    //vm.$mount把vm的挂载单独书写出来(除了我们可以自由选择挂载时机以外,和el配置项没有其他的区别)
    setTimeout(() => {
      vm.$mount("#app")
    }, 2000)
</script>

</html>